Note 1 — Chapter XII · FURTHER CONSIDERATION OF CRYSTALLISATION

There is a physical cause—a mad impulse, a rush of blood to the brain, a disorder in the nerves and in the cerebral centre. Observe the transitory courage of stags and the spiritual state of a soprano. Physiology, in 1922, will give us a description of the physical side of this phenomenon. I recommend this to the attention of Dr. Edwards(8).